Polyol ester compounds useful in preparation of a catalyst for olefins polymerization, process for preparing the same and use thereof

Abstract

The present application relates to polyol ester compounds, having general formula (I): R1CO—O—CR3R4-A-CR5R6—O—CO—R2 (I) wherein, R, and R2 groups, which may be identical or different, can be substituted or unsubstituted hydrocarbyl having 1 to 20 carbon atoms, R3-R6 groups, which may be identical or different, can be selected from the group consisting of hydrogen, halogen or substituted or unsubstituted hydrocarbyl having 1 to 20 carbon atoms, R1-R6 groups optionally contain one or more hetero-atoms replacing carbon, hydrogen atom or the both, said hetero-atom is selected from the group consisting of nitrogen, oxygen, sulfur, silicon, phosphorus and halogen atom, two or more of R3-R6 groups can be linked to form saturated or unsaturated monocyclic or polycyclic ring; A is a single bond or bivalent linking group with chain length between two free radicals being 1-10 atoms, wherein said bivalent linking group is selected from the group consisting of aliphatic, alicyclic and aromatic bivalent radicals, and can carry C1-C20linear or branched substituents; one or more of carbon atom and / or hydrogen atom on the substituents can be replaced by a hetero-atom selected from the group consisting of nitrogen, oxygen, sulfur, silicon, phosphorus, and halogen atom, and two or more said substituents on the linking group as well as above-mentioned R3-R6 groups can be linked to form saturated or unsaturated monocyclic or polycyclic ring. The compounds of formula (I) find use in preparing a catalyst for olefin polymerization.

Description

CROSS REFERENCE OF RELATED APPLICATION [0001] The present application claims priority based on Chinese Patent Application No. 02100896.5, filed on Feb. 7, 2002, which is incorporated herein by reference in its entirety and for all purposes. TECHNICAL FIELD [0002] The present invention relates to a type of novel compounds, a process for preparing them and their use in preparing a catalyst for olefin polymerization, in particular, to a compound comprising two or more ester radicals, a process for preparing them and their use in preparing a catalyst for olefin polymerization. TECHNICAL BACKGROUND [0003] It is well known that solid titanium catalyst component with magnesium, titanium, halogen and electron donor as basic compositions can be used in the polymerization of olefin CH2═CHR, especially in the polymerization of alpha-olefins having 3 or more carbon atoms, higher isotactic polymer can be obtained in higher yield. An electron donor compound is one of indispensable compositions of...

AI Technical Summary

Problems solved by technology

However, above-mentioned olefin polymerization catalysts prepared utilizing disclosed aromatic dicarboxylic ester compound, 1,3-diether compound containing two ether groups and aliphatic dicarboxylic ester compound exist certain defects in actual use.

For instance, the catalytic activity of the catalyst with aromatic dicarboxylic ester compound is low, and the distribution of the molecular weight of the polymer obtained is narrow; although the catalyst with 1,3-diether compound has high catalytic activity and good hydrogen response, the distribution of the molecular weight of the polymer obtained is narrow, and this is disadvantageous in the development of different grades of polymers; and the catalytic activity of the catalyst with aliphatic dicarboxylic ester compound disclosed recently is still some low, and when external donor compound is not used, the isotacticity of the polymer obtained is lower.

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